I ended up basket weaving my graduation cap for graduating high school.
I was the first to ever do this at the school I went to, plus I also ended up being a speaker at the ceremony (in front of 800 or so people no less).
This took a while, it's fairly easy to do... it just takes a lot of time. The top part of the cap was the most frustrating. I used sinew and twine, purple and white for my school's colors. I also sewed an abalone button on top. The back had leather for a more secure fit (my dad helped me with that part). Also, I ended up wearing beaded baby eagle feathers (my mom beaded them for me).
Material: red cedar